Oil-filtering attachment for furnaces



M. BLUM.

OIL FILTERING ATTACHMENT FORTURNACES. APPLICATION FILED MAR-15,1919.

1,332,377, T Patented Mar. 2, 1920.

2 SHEETSQSHEET 1.

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T J7 m M. BLUM.

OIL FILTERING ATTACHMENT FOR FURNACES.

APPLICATION FILED MAR. I5, I9I9. I

Patented Mar. 2, 1920.

2 SHEETS-SHEET 2- MAX BLUM, 0F IBLOOMINGTUN, ILLINOIS, ASSIGNOR TO DEREMER-BLATCHFOBD COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

OIL-FILTERING ATTACHMENT FOR FURNACES.

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Specification of Letters Patent.

Patented ML'arQEE, 1929,.

To all whom it may concern: 7

Be it known that-T, MAX BLUM, a citizen of the United States, residingat Bloomington, in the county of McLean and State of Illinois, haveinvented certain new and useful Lnprovei'nents in Oil-FilteringAttachments for Furnaces, of which .the following 1s a specification.

My invention relates to oil burning furnaces, and the principal objectof the in vention is to provide means associated with the oil supplypipe of a furnace of this type for filtering-and at the same timeheating the oil before it reaches the burner. The heating of the oilincreases its fluidity and makes possible a more etlicient filteringthereof, since finer mesh screens may be employed than when the oil iscold. The increased fluidity facilitates vaporization at the bin-nor,and tends to insure complete combustion.

The invention consists of the novel and improved constructions,arrangements and devices to be hereinafter described and claimed, forcarrying out the above stated objects as will appear from the followingdescription. p

The inventionis illustrated in certain. preferred embodiments in theaccompanying drawings, wherein:

Figure 1 shows a side elevational view of a device embodying myinvention connected to a furnace;

Fig. 2 is a plan view of the heating device and furnace, shown in F ig.1;

Fig. 3 is a front elevational view of the heating device and furnaceshown inl ig. 1, and showing the heating device connected to the burnerof the furnace; and

Fig. l is a sectional view of the heating and filtering device, taken onthe line lt of Fig. 2.

Like characters of reference indicate like parts in the several figuresof the drawings.

The heating and filtering device comprises a casing 10 which isconnected to a source of oil supply (not shown) by means of a pipe 11,provided with a valve 12 to cut off the supply of oil when desired. litis also connected to the burner 13 under the combustion chamber 14- ofthe furnace 15 by means of a pipe 16, provided with the valve 17 tocontrol the flow of fuel therethrough. The burner 13, combustion chamber14: and furnace 15 form no part of my invention,

and will not, therefore, be described in detail.

The casing 10 of the filtering and heating eter than the bore 19 andsomewhat larger in diameter than the bore 18, thus, as will be clearlyseen froni Fig. 4, providing the annular shoulders 21 and 22. The lowerend of the heating and filtering device is internally screw-threaded andis closed by means of a'screw plug 23 which is preferably dish shapedand adapted to receive any sediment deposited therein from the oil. Theheating device may be provided with a plurality of wire screens tostrainthe: oil, preferably the screen of fine mesh and the screen 25 ofcoarser mesh. The screen 2-l is approximately the same diameter as thecentral bore 20 and fits snugly against the annular shoulder 21. Thescreen 25 is approximately the same diameter as the lower bore orchamber 19 and fits snugly against the annular shoulder 22. The screens24 and 25 are held against the respective shoulders 21 and 22 by meansof the rod 26 which is threaded through the cap or plug 23. The rod 26passes through the center of the screens 24 and 25 and is provided witha plurality of nuts 27. Preferably the nuts are adjustedon the rod 26 sothat the screens will be flexed slightly against the shoulders 21 and 22to insure aclose fit. The inlet pipe 11 is threaded into the lowerchamber 19 and the outlet-pipe 16 is threaded into the upper chamber 18.The upper chamber 18 may be provided with an outlet 28 in addition tothe one for the pipe 16, thereby making it possible to connect thefiltering device so as to supply fuel or gas to two burners, or so thatit can be used on either side of the furnace. The outlet 28 not in useis closed by means of a threaded plug 29. The lower chamber 19 isprovided with a blow-0d cook 30 so that any water or vapor that mayaccumulate in the lower chamber 19 may be drawn ofi as often asrequired.

Heat is preferably supplied to the casing 10 by means of an overhanginghot air pipe 31 which has communication with the worktil top of thefiltering device. The volume of hot air may be regulated by means of thegate or valve 32 in the pipe 31.

The operation of the device 1s very simple. The fuel oil is fed to thefiltering and heating device 10 under pressure. The gate 32 is openedand a. steady flow of hot air plays on the heating and filtering device10, which thoroughly heats the walls of the entire de vice. The heat istransmitted to the incoming stream of oil in the chamber 19 which actsrapidly to thin the oil so it will readily pass through the screens 25and 24, even if they are of very fine mesh. All foreign matter carriedin the oil is freely given up and collects in the dish-shaped plug 23.Whatever water there is in the oil will be readily separated and willcollect in the chamber 19 and niay be drawn oil by means of the cook 30.The heating of the oil as described facilitates its vaporization at theburner.

While I have described my invention in a certain preferred embodiment,it will be understood that modifications might be made without departurefrom the principles of the invention. Therefore I do not wish to beunderstood as limiting the invention to the precise arrangements,constructions and devices shown and described, except so far as certainof the claims herein are specifically so limited.

1 claim:

1. The combination with the oil supply pipe of an oil burning furnace,of a filter device arranged in said supply pipe comprising a hollow'bodyclosed at the top and open at the bottom having upper and lowerchambers, the oil suppl pipe leading to said lower chamber and leading.from the top of said upper chambenan annular shoulder formed on theinside walls of said body between said chambers, a screen, a screwplug'adapted to close said body at the bottom, a rod supported on saidplug and adapted to. hold said screen against said shoulder, a pipeleading from the combustion chamber of the furnace ieaaarr for applyinghot gas to said filtering device to increase the fluidity of the oilduring the filtering operation. I

2. The combination with the oil supply pipe of an oil burning furnace,of a filtering device arranged in said supply pipe comprising a hollowbody closed at the top and open at the bottom having'upper and lowerchambers, the oil supply pipe leading to said lower chamber and fromsaid upper chamber,'annular shouldersformed on the inside walls of saidbody between said chambers, a screen of coarse mesh, a screen of finemesh disposed over the other screen, a screw plug adapted to close saidbody at the bottom, a rod supported by said plug and adapted to holdsaid screens against said shoulders, and a pipe leading fromthe'combustion chamber of the furnace for applying hot gas to theliltering device.

3. The combination with vthe oil supply pipe of an oil burning furnace,of a filtering device arranged in said supply pipe comprising a hollowbody closed at the top and open at the bottom having upper and lowerchainbers, the oil supply pipe leading to said lower chamber and fromsaid upper chamber, annular shoulders formed on the inside walls of saidbody between said chambers, a screen of coarse mesh, a screen of finemesh disposed over the other screen, means to hold said screens againstsaid shoulders, a screw plug adapted to close said body at the bottomand avpipe leading from the combustion chamber of-the furnace forapplying hot gas to the liltering device.

l. The combination with the oil supply pipe of an oil burning furnace,of a filtering device arranged in said supply pipe comprising a hollowbody closed at the top and open at the bottom having upper and lowerchambers, the oil supply pipe leading to said.

lower chamber and from said upper chamber, annular shoulders formed onthe inside walls of said body between said chambers, a plurality ofscreens and means to hold them against said shoulders, a dish-shapedscrew plug adapted to close said body at the bottom, and a pipe leadingfrom the furnace and adapted to apply hot gas to the filtering device.

MAX BLUM.

